When you try to have a newer verison installed on an existing installation, the Kaspersky Internet Security(KIS) 2012 BETA Setup Wizard will disapprove of your installation, warning you that “Internal Error 2771″ error box shown later on. To fix/uninstall Kaspersky Internet Security 2771 errors, you need to completely delete/uninstall the previous edition you had, restart your PC, and then try to re-install a newer version.